74results about How to "To achieve the purpose of silence" patented technology

The invention relates to the field of mufflers, and particularly provides a three-layer series micro-perforated pipe muffler which comprises a muffler body, an intake end and an exhaust end. The muffler body is of a three-layer micro-perforated pipe structure for muffling, aperture ranges from 0.1mm to 0.5mm, porosity is less than 5%, gaps are formed between three-layer micro-perforated pipes without being filled with filling materials, the three-layer micro-perforated pipes are different in aperture, equal in porosity and different in cavity volume, and noise in different frequency bands is eliminated. When the muffler is at work, airflow directly flows through a pipeline, and back pressure loss is low. The exhaust muffler is simple in structure, convenient to process and low in cost, and is resistant to high temperature, corrosion and airflow impact and long in service life as being of a pure-metal structure. The muffler has good muffling effect in the whole spectral range and particularly in high-frequency band, and muffling volume reaches 15-25dB.

The invention discloses a ground brush assembly of a dust collector and the dust collector with the ground brush assembly. The ground brush assembly of the dust collector comprises a ground brush bottom shell, a ground brush upper cover and an air channel upper cover, wherein the ground brush bottom shell is provided with an air inlet; the ground brush upper cover is arranged on the ground brush bottom shell and an air channel is limited between the ground brush upper cover and the ground brush bottom shell; the air channel is communicated with the air inlet; the air channel upper cover is arranged between the ground brush upper cover and the ground brush bottom shell; a plurality of ventilation holes, which are distributed at intervals, are formed in the ground brush upper cover; each ventilation hole is communicated with the air channel. According to the ground brush assembly of the dust collector, disclosed by the embodiment of the invention, the ground brush upper cover with the plurality of ventilation holes is arranged between the ground brush bottom shell and the ground brush upper cover, so that rapid dirty air flow can be dispersed and becomes slow; meanwhile, high-frequency sound waves in the dirty air flow are also attenuated, so that the aim of reducing noises is realized. The ground brush assembly of the dust collector is simple and compact in structure; the sealing and the dust removing efficiency of a ground brush are not influenced and the silencing aim can be realized, so that the user experience is good.

The invention discloses a sound attenuation device for an automobile engine. The device comprises an outer shell, an air inlet pipe is installed in the middle of the left end of the outer shell, and an air discharge pipe is installed at the right end of the outer shell; a cylindrical inner shell is installed in the shell, a vacuum cavity is formed between the outer side face of the inner shell andthe inner side face of the outer shell; hemispherical sound attenuation salient points are evenly distributed on the inner side face of the inner shell, a vertical circular partition plate is installed in the middle of the inner shell, first flow division holes are formed circumferentially in the circular partition plate at equal intervals, and the middle of the left side face of the circular partition plate is connected with the right end of the air inlet pipe. According to the sound attenuation device for the automobile engine, a second flow division hole is formed in the air inlet pipe connected with an air discharge port of the engine and used for conducting flow division on air so that the air can be evenly dispersed in a sound attenuation cylinder; first sound attenuation holes evenly distributed in the sound attenuation cylinder are used for conducting flow guide dispersion on the air, energy brought by the air cancels each other out, and the noise reduction aim is achieved.

The invention provides a silencing device for a pneumatic tool, comprising a shell and at least two silencing sheets which are arranged in the shell; the shell is provided with a circumferential wall and a plurality of embedding parts which are arranged on the circumferential wall at intervals along the circumferential direction and extend in the axial direction; the silencing sheets are provided with a plurality of silencing holes and at least a clamping part which is arranged on the external circumferential surface and is sheathed with the embedding part; furthermore, the silencing holes of two adjacent laminated silencing sheets are arranged in a staggered way; therefore, as the silencing holes of the two adjacent laminated silencing sheets are arranged in the staggered way, the airway is circuitous, the airflow speed and the pressure are greatly reduced, thus lowering the volume.

The invention provides a puncture outfit comprising a silencer. The puncture outfit is characterized in that an end sealing assembly of a sheath tube of the puncture outfit comprises an upper cover, a radial sealing assembly, the silencer and a lower cover; the silencer is an elastomer capable of generating elastic deformation, one end of the silencer is mounted on the radial sealing assembly, and the other end of the silencer is mounted on the lower cover; the radial sealing assembly is mounted between the upper cover and the lower cover. Due to the fact that the radial sealing assembly is supported by the silencer, a gap between the upper cover and an upper press plate of the radial sealing assembly is reduced, and impact sound produced when surgical instruments are retreated outwards is avoided; meanwhile, the impact sound produced when the surgical instruments are propelled inwards is avoided under the buffering action of the silencer. Therefore, the impact sound cannot be produced when the surgical instruments move back and forth in the puncture outfit, and the purpose of silencing is achieved.

The invention relates to a silencer of a high-pressure blower. The silencer comprises a wind tub and a motor, wherein the output shaft of the motor extends into the wind tub, and the extending-in end of the output shaft is fixedly connected with a wind blade; a wind inlet and a wind outlet are formed in the wind tub; the silencer comprises a strip-shaped box body, a wind intake hole is formed in the end surface of one end of the box body, and a wind exhaust hole is formed in the end surface of the other end of the box body; the wind intake hole is communicated with the wind outlet in the wind tub; a plurality of strip-shaped partition boards are fixedly connected to the inner part of the box body, and the box is divided into a plurality of chambers through the partition boards; every two adjacent chambers are communicated, and the wind intake hole is communicated with the chamber in one side of the box body; the wind exhaust hole is communicated with the chamber in the other side of the box body; both ends of the box body are respectively and fixedly connected with one cover plate, and the inside surfaces of the cover plates are fixedly connected with acoustical coatings which are sprayed by anti-noise paint. When air currents generate impact on the partition boards, the inner wall of the box body and the cover plates, noise is absorbed, so that the silencer of the high-pressure blower has a better erasing effect, and the whole quality of the blower is improved.

The invention relates to a high-speed heavy-load mute tow chain composed of a plurality of chain links which are connected end to end, wherein a rotary limiting mechanism is arranged at the rotary connection part of every two chain links and is formed by four rotary limiting structures distributed at intervals in the peripheral direction by taking the center of the rotary connection as reference; each rotary limiting structure is composed of a first structure arranged at the tail side surface of a chain plate of the previous chain link and a second structure correspondingly arranged at the head side surface of a chain plate of the next chain link, and the first structures are matched with the second structures; the rotation angles and directions, reflected between every two adjacent chain links, of the four rotary limiting structures are the same, so that load and impact, which are brought by the rotary limiting structures, between the two adjacent chain links can be shared together; in order to realize mute in each rotary limiting structure, a buffer component is arranged between the impact surfaces of the first structure and the second structure at two ends of the corresponding rotary limiting structure. Since a multi-support and multi-buffer structure is adopted, the high-speed heavy-load mute tow chain has the beneficial effects of high speed, heavy load and mute property.

The invention discloses a surgical vacuum aspiration device which comprises a bottom support part, a liquid collection device and a negative pressure generation device, wherein the liquid collection device is detachably mounted at the upper part of the bottom support part; and the liquid collection device is communicated with the negative pressure generation device. According to the surgical vacuum aspiration device, tipping of a liquid collection bottle can be effectively avoided; outflow of liquid in the liquid collection bottle can be avoided; contamination of an operating room by the liquid in the liquid collection bottle can be effectively avoided, so that iatrogenic viral transmission is avoided; damage of a vacuum pump due to entry of the liquid can be effectively avoided, so that aservice life of the device is guaranteed; a clear operation field environment is provided for medical care personnel by vacuum aspiration of waste liquid generated in a cardiac surgery of a patient,so that successful performance of the surgery is guaranteed; scratches of a pathological tissue of the patient can be avoided; traumas generated in the cardiac surgery of the patient can be effectively reduced; and the influence of too large noise during operation of the vacuum pump on the surgery performed by the medical care personnel can be avoided.

The invention relates to the technical field of silencing, in particular to a silencing exhaust hose. The silencing exhaust hose comprises a hose body provided with a hollow cavity, wherein an air inlet and an air outlet are formed in two ends of the hose body; a silencer is arranged in the hose body; the length of the silencer is smaller than that of the hose body. According to the silencing exhaust hose, airflow is decomposed to countless weak and fine airflow through layers of silencing plates, so that the purpose of silencing is achieved; a part of airflow can be weakened through auxiliary silencing through holes of a silencing tube, meanwhile, the airflow is prevented from being blocked between the silencing plates, so that the purpose of silencing is achieved. The silencing exhaust hose has the advantages of simple structure, low cost and good silencing effect.

The invention provides a water cooling energy-saving mute pump. The water cooling energy-saving mute pump comprises a pump body, a submersible motor is arranged in the pump body and vertically connected with a flow guiding bracket, the flow guiding bracket is located over the submersible motor, the submersible motor is located at the lower end of the pump body and fixed to a flow guiding base, theside face of the flow guiding base is provided with an inlet, and the submersible motor is connected with the top of the flow guiding base in a sealing mode through a second outer cylinder used for motor cooling flow passing; a shaft body of the submersible motor is connected with a pump shaft of the pump body through a spline connecting block, at least three impellers which are vertically arranged are arranged on the outer side of the pump shaft, every two vertical adjacent impellers communicate with each other through a flow guiding part, the second outer cylinder and a first outer cylinderare fixed through bolts, and the first outer cylinder is located outside the flow guiding parts; and an outlet of the pump body is formed in the top, a pump cover is arranged at the outlet of the pump body, and a flange is movably connected to the pump cover.

The embodiment of the invention provides a silencer and an engine. The silencer comprises an air inlet pipe, a silencing chamber, a first expansion chamber, a first baffle and a first resonance chamber, and the air outlet end of the air inlet pipe penetrates through an air inlet of the silencing chamber in a gapless manner and is arranged on the silencing chamber in the manner of being opposite toand communicating with an air inlet of the first expansion chamber; the closed end of the first expansion chamber penetrates through a first through hole of a first baffle plate arranged in the silencing chamber and is arranged in the silencing chamber, one end, provided with an air outlet, of the first resonance chamber serves as a first end to penetrate through an air outlet of the silencing chamber in a gapless manner, and the second end is in complete contact with the closed end of the first expansion chamber. By applying the scheme, the service life can be prolonged without being influenced by the environment temperature.

The invention discloses an oblique-straight helical water guide rib pipe, which is composed of an inner layer and an outer layer which are interconnected via ribs, wherein the inner wall of the inner layer of the pipe is provided with helical ribs which are evenly distributed in an oblique-straight way, and an included angle between a central line B of the helical ribs and a central line A of the pipe is 12 to 30 degrees. In the proposal, the pipe is composed of the inner layer and the outer layer which are interconnected via the ribs to form a pipe, in particularly, the inner wall of the inner layer of the pipe is provided with helical ribs which are evenly distributed in an oblique-straight way, and under the guide of the helical ribs, water streams flow downwards along the inner wall of the inner layer of the pipe according to the oblique-straight trend of the helical ribs during drainage in order to avoid the water streams causing strong impact to the inner wall of the inner layer of the pipe, thereby achieving the purpose of lowering noise.

The invention relates to the technical field of noise reduction of an air conditioner, and particularly discloses a noise elimination and sound insulation device for an outdoor unit of an air conditioner. The noise elimination and sound insulation device for the outdoor unit of the air conditioner comprises a cover body covering the outdoor unit of the air conditioner, wherein an air inlet and anair outlet are arranged on the cover body, the air inlet is far away from the air outlet, and the air inlet is lower than the air outlet; a first space and a second space which are used for separatingthe space around the outdoor unit of the air conditioner are arranged in the cover body, the air inlet end of the first space communicates with the air inlet of the cover body, and the air outlet endof the first space communicates with the air inlet end of an air inlet grille of the outdoor unit of the air conditioner; the air inlet end of the second space communicates with the air outlet end ofa cooling fan of the outdoor unit of the air conditioner, and the air outlet end of the second space communicates with the air outlet of the cover body; and an air inlet silencing assembly is arranged in the first space, and an air outlet silencing assembly is arranged in the second space. The scheme provided by the invention is used for solving the problems that in the prior art, the quality ofa sound environment where people live is reduced due to noise pollution caused by the operation of an outdoor unit of an air conditioner, and the normal sleep and rest of the people are seriously affected.

The invention discloses a silencer of a motorcycle cylinder. The silencer comprises an air inlet pipe, wherein the air inlet pipe is connected with one end of a sound absorption and air inlet opening through threads; the other end of the sound absorption and air inlet opening penetrates through a shell and is fixedly connected with a sound absorption chamber; the left side of the sound absorption chamber is fixedly connected with one end of a sound absorption and air outlet opening; the other end of the sound absorption and air outlet opening is connected with an inner pipe through threads; the inner pipe penetrates through an outer pipe, and extends into the outer pipe; sound attenuation holes are formed in the inner pipe; the top and the bottom of the inner pipe are separately fixedly connected with a sucking disc; each sucking disc is fixedly connected with the inner wall of the outer pipe; the left side of the outer pipe is fixedly connected with one end of an air outlet; and the other end of the air outlet penetrates through the shell, and is connected with an air outlet pipe through threads. According to the silencer of the motorcycle cylinder, a double-sound-attenuation structure is adopted, so that a sound attenuation effect is more obvious; use by people is facilitated; and a driver is free from annoyance caused by noise.

The invention relates to the technical field of floor slabs, in particular to a sand-plastic plate with functional assemblies. The sand-plastic plate comprises a sand-plastic plate body and a plurality of functional assemblies, wherein the functional assemblies are arranged in the sand-plastic plate body or formed at the edges of the sand-plastic plate body. According to the sand-plastic plate with the functional assemblies, the specific function can be achieved.

The invention discloses a method for reducing air in a core bag of a capacitor. The method includes the following steps: firstly, whether the width of a metallized film of an upper film ring and the width of a metallized film of a lower film ring are consistent is judged through a venier caliper, the error should be smaller than 0.1mm, whether the film rings are deformed and whether a slitting face is smooth are judged, after requirements are met, the films are placed onto a machine to be rolled, the edge staggering amount of the films is controlled to range from 0.8mm to 1.0mm in a rolling test, and spot check is carried out in a middle and later period of rolling; then when thermal polymerization is carried out for the first time, the temperature is adjusted to be 70 DEG C, and the polymerization time is 24 hours. Due to proper edge staggering, metal spraying particles and metallized layers on two poles of the core bag are fully combined, gaps on sections caused by edge staggering can be fully sprayed, due to long-time polymerization at 70 DEG C before spraying, stress and moisture in the core bag generated in rolling can be eliminated, logging of the staggered edges can not occur, the metal spraying particles can be fully atomized through fine zinc wires and high metal spraying pressure and can conveniently enter a hollow space of the staggered edges, and the full-filling purpose is achieved.

The invention relates to the technical field of motor auxiliary equipment, in particular to a novel motor noise reduction shell, which comprises a main box body, a top plate, an air inlet box and an air exhaust box. The top plate is detachably arranged above the main box body, the air inlet box is arranged on the side wall of the main box body, and the air exhaust box is arranged above the top plate; the air inlet box and the air exhaust box are both communicated with the main box body, a motor is arranged in the main box body, noise reduction lining plates are laid on the inner wall of the main box body and the lower surface of the top plate, and a plurality of peak-shaped protrusions are densely distributed on the surfaces of the noise reduction lining plates. According to the novel motor noise reduction shell provided by the invention, an inner wall with a noise reduction structure and a damping device are arranged, so that the noise of the motor during operation is effectively reduced.

The present invention provides a general minitype silent generator set, characterized in that the generator set is composed of a front cover blasting device, a dynamic heat sink, an air filter inlet system, a motor heat sink, a tail air exhaust device, a dome, a body, a muffler, a rear cover, a handle, a casing and a frame, the frame is provided in the casing, the body is mounted on the frame. The front of the body is provided with the front cover blasting device, the dynamic heat sink, the air filter inlet system; the back of the body is provided with the motor heat sink, the tail air exhaust device. The dome is mounted on the front cover blasting device, the front cover blasting device is connected with the air filter inlet system, the air filter inlet system is provided outside of the body and inside of the front cover blasting device. One end of the dynamic heat sink is connected with the front cover blasting device, the other end is connected with the body. One end of the motor heat sink is connected with the body, the other end is connected with the casing. The tail air exhaust device is connected with the rear cover having handle, the muffler is provided on the body. The advantage of the invention is that the generator set is normal work under the conditions of rated load and overload, and realizing the aim of silence.

The invention discloses a vehicle silencer. A shell is included. The two axial ends of the shell are provided with an air inlet end and an air outlet end correspondingly. The shell comprises an uppershell and a lower shell combined with the upper shell. Each of the upper shell and the lower shell internally comprises an inner pipe through which airflow passes in a conduction manner and a plurality of resonant cavities divided by radiation ribs and surrounding the inner pipe. A gap is formed between the two inner pipes in the axial direction of the shell. The inner pipes communicate with the resonant cavities through the gap. The radial section area of the air inlet end and the air outlet end is smaller than the radial section area of the inner pipes. Through the arrangement, combination of an expansion cavity type silencing structure and a Helmholtz silencing structure is achieved, under the coordinative action of the combination of the two silencing structures, spread energy is rapidly attenuated, and accordingly silencing is achieved; silencing holes do not need to be arranged, the silencing performance is excellent, airflow noise can be obviously lowered, the silencing effect for 500 Hz low-frequency noise is particularly obvious, and a reliable technology solution is provided for enhancing the vehicle taking experience of passengers.

The invention discloses a muffling tail pipe with a decorative pipe, which comprises a tail pipe and the decorative pipe, wherein the tail pipe is inserted into the decorative pipe of which the caliber is larger than that of the tai pipe; the tail end of the tail pipe is made into a horn mouth; the end face of a large-mouth end is firmly welded with the inner wall of the decorative pipe; the pipe body of the tail pipe is provided with a plurality of small holes; an end cover covers the front end of the decorative pipe and is sleeved on the tail pipe, the inner ring edge of the end cover is airtightly welded with the outer wall of the tail pipe, and the outer ring edge of the end cover is airtightly welded with the decorative pipe; the outer wall of the part of the tail pipe, which is inserted into the decorative pipe, the end cover and the inner wall of the decorative pipe jointly enclose to form an expansion chamber. Through the tail pipe with the decorative pipe with the structure, the spatial structure is effectively utilized, the chassis space is not occupied, and different muffling requirements can be met; impedance can be generated by the change of a section formed between the horn mouth of the tail pipe and the decorative pipe to achieve certain muffling effect; meanwhile, the horn mouth can reduce gas flow and reduce exhaust back pressure.

The invention discloses a noise reduction device. The noise reduction device comprises an air duct structure and a plurality of noise reduction parts, an air duct is constructed in the air duct structure and communicates with the exterior, the multiple noise reduction parts are arranged in the air duct in an array mode, in the process that sound waves impact the noise reduction parts or are reflected, sound energy is gradually decreased, and then the decibel of sound is decreased. According to the noise reduction device, the noise reduction parts are arranged in the air duct, so that in the process that the sound waves entering the air duct impact the noise reduction parts or are reflected in the air duct, the sound energy is gradually decreased, then the decibel of the sound is decreased,even the sound energy is gradually decreased to be zero, thus the effect of noise removal in the air duct is achieved, and meanwhile, the noise reduction device is simplified in structure, fast and convenient to mount, low in cost and obvious in noise reduction effect.

The invention discloses a two-way sound box, comprising: a hollow box with an arc-shaped bent pipe structure; a main speaker arranged at the left end of the box; and a secondary speaker arranged at the right end of the box, wherein the The back of the main speaker is opposite to the back of the secondary speaker, and the central axis of the main speaker forms a certain angle with the central axis of the secondary speaker. The present invention has the beneficial effect of ensuring that the sound quality of the sound box can be maximized as a whole by solving the problem of poor bass sound quality of the sound box at the present stage under the premise that the size of the sound box is not too large.

The invention provides a method for denoising an axial flow fan. According to the method, a silencing bottom cover, a stator, a rotor and M-shaped brackets comprising rubber damping rods are included; the silencing bottom cover comprises a first silencing pipe, a second silencing pipe, a silencing chamber and a sounding pipe; one end of the first silencing pipe and one end of the second silencing pipe are connected with the upper end and the lower end of the silencing chamber respectively, the other end of the first silencing pipe and the other end of the second silencing pipe are connected with the right outer wall of the silencing bottom cover, and the left side of the silencing bottom cover is connected with the left outer wall of the silencing chamber through the sounding pipe; the rotor is arranged in the stator, the outer wall of the stator is provided with the M-shaped brackets, and one sides of the M-shaped brackets are fixedly connected with the outer wall of the stator. The method for denoising the axial flow fan has the beneficial effects that the M-shaped brackets are arranged on the outer wall of the stator and can be fixed to the inner wall of a machine case to decrease collisions, and the purposes of reducing vibration and noise are achieved; by arranging the silencing bottom cover, sound waves can enter the silencing chamber from the first silencing pipe and the second silencing pipe; accordingly, when the sound waves enter the silencing chamber, wave crests and wave troughs are balanced, and the silencing purpose is achieved.

The invention relates to a heavily loaded silent hinge which comprises a hinge cup, a connecting rod assembly, a hinge arm, a base, a crankshaft assembly and an elastic part. The hinge cup has closing force by the aid of the elastic part, the hinge arm is adjustably mounted on the base, the connecting rod assembly comprises a connecting rod and connecting rod shaft sleeves, one end of the connecting rod is hinged to the hinge cup, the other end of the connecting rod is hinged to the hinge arm, and the connecting rod shaft sleeves are sleeved in first hinge holes in two ends of the connecting rod respectively. The crankshaft assembly comprises a crankshaft, a crankshaft sleeve and a crankshaft fixing shaft sleeve, one end of the crankshaft is hinged to the hinge cup, the other end of the crankshaft is hinged to the hinge arm, the crankshaft sleeve is sleeved in a second hinge hole of the crankshaft correspondingly hinged to the hinge cup, the crankshaft fixing shaft sleeve is sleeved in a third hinge hole of the crankshaft correspondingly hinged to the hinge arm, and the hinge cup drives the crankshaft and connecting rod to rotate in the door opening and closing process, so that a door is opened and closed. As the shaft sleeves are sleeved in the hinge holes of the crankshaft and the connecting rod, frictional resistance is low in the transmission process, and silence is achieved.

The invention discloses an exhaust silencer for engineering machinery. The exhaust silencer for the engineering machinery comprises a pipe body, clapboards, an air outlet diffusion pipe, an air inlet diffusion pipe, a short intermediate pipe and a long intermediate pipe, an end cover for sealing the pipe body is arranged at each of two ends of the pipe body, two clapboards are arranged in the pipe body to divide the pipe body into a first cavity, a second cavity and a third cavity, a screen plate parallel to the clapboard is arranged in the second cavity, the long intermediate pipe respectively runs through the two clapboards and the screen plate to communicate the first cavity with the third cavity, the short intermediate pipe respectively runs through the clapboard between the first cavity and the second cavity and the screen plate to communicate the first cavity with the second cavity, sound absorption material is filled between the clapboard between the first cavity and the second cavity and the screen plate, one ends of the air outlet diffusion pipe and air inlet diffusion pipe vertically run through the pipe body, and the other ends are closed by end caps. The exhaust silencer for the engineering machinery enables the whistling of an engine supercharger of the engineering machinery to be well eliminated through high frequency silencing by means of multiple steering and multiple vent holes.

The invention discloses a motorcycle protection device with a warning protection function. The motorcycle protection device with the warning protection function comprises a gas inlet pipe, a fixing block is fixedly connected to one end of the gas inlet pipe, an exhaust pipe is fixedly connected to the end, away from the gas inlet pipe, of the fixing block, a protection assembly is arranged on thesurface of the exhaust pipe, the protection assembly comprises an outer protection pipe, and the inner wall of the outer protection pipe is fixedly connected with a connecting block. According to themotorcycle protection device with the warning protection function, by arranging a telescopic rod to match with a damping spring and a contact head, the damping spring drives the telescopic rod to enable the contact head to be tightly attached to the surface of the exhaust pipe, and when the exhaust pipe vibrates inside the protection assembly, the exhaust pipe extrudes the contact head towards oneend of the telescopic rod, the telescopic rod matches with the damping spring so that the vibration of the exhaust pipe can be buffered, a rubber ring is tightened when the telescopic rod receives pressure through a first sound insulation cotton, the vibration of the exhaust pipe is protected, and the purposes of being good in protection effect and prolonging the service life are achieved.

The invention discloses an agricultural tractor chimney denoising device. The device comprises a denoising pipe, wherein one end of the denoising pipe is in threaded connection with an inlet pipe, theother end of the denoising pipe is connected with an outlet pipe, the inner wall of the denoising pipe is fixedly connected with a layer of silencing wall, the surface of the silencing wall is uneven, and a silencing porous plate perpendicular to the pipe axis direction is mounted in the denoising pipe. The device is provided with the silencing porous plate, and the purpose of silencing is achieved by utilizing conical through holes on the silencing plate, wherein the conical through holes are similar to a honeycomb structure, and the different distances of the noise in contact with the conical through holes, the reflection distance and the reflection path achieve the purpose of silencing; and meanwhile, the silencing wall is adopted, so that the noise is isolated through the thickness ofthe silencing wall, the noise is reflected through the uneven surface on the silencing wall, and the purpose of noise cancellation is achieved.

The invention discloses a silencing method for an air pipeline. The method includes the following steps that (1) a plurality of air outlets are installed at an outlet of the air pipeline, air outlet covers for adjusting the air outlet amount are arranged on the air outlets, and the air outlet amount of the air outlets can be adjusted conveniently through the air outlet covers; (2) the air outlet amount of the air outlets is adjusted, and the air outlet amount of one air outlet is reduced, so that flowing air generates turbulent flow when passing through the air outlet with the relatively-smaller air outlet amount, and the air noise of air flow exhausted from the other air outlets is reduced; and (3) a silencing pipe is installed on the air pipeline and is installed at the front end of theair outlets, many bent parts exist in the air pipeline, the air flow is prone to vibration and wind noise generation after passing through the bent parts, and after the air flow having the wind noisepasses through the silencing pipe, the silencing pipe absorbs most of the wind noise in the air flow, so that the wind noise is prevented from being exhausted through the air outlets, and the purposeof silencing is achieved.

The invention provides a sound insulation board mechanism suitable for municipal construction with high corrosion resistance, relates to the technical field of sound insulation boards, and solves the problem that the existing sound insulation boards often use a honeycomb slot structure for sound absorption during use. In the process of municipal construction, most of the fence-type sound-absorbing panels used are single-sided closed structures, that is, sound is absorbed on one side and sound is emitted from the other side. The sound-absorbing effect is not good, and it is difficult to achieve the noise generated by construction The problem of the purpose of the partition includes the anti-corrosion end sealing plate; the front and rear end edges between the upper and lower two anti-corrosion end sealing plates are respectively vertically fixed with anti-corrosion outer baffles; the two front and rear anti-corrosion outer baffles U-shaped side sealing plates are respectively vertically slid and clamped at the left and right ends of the body. In the present invention, since the anti-corrosion outer baffle is provided with uniformly spaced four-sided truncated cone-shaped one-way sound-absorbing holes with narrow outer ends and wider inner ends, the sound is reflected, and no matter which side of the sound insulation board comes from the sound Neither can be transmitted from the board.

The present application relates to a noise reduction device for a drilling rig, which includes: a sealing cylinder and a sealing cover, the sealing cylinder is arranged on one side of the sealing cover, and the sealing cover is provided with a through hole for passing a drill bit, the axis of the drill bit The axis is the same as that of the sealing cylinder; the sleeve is arranged coaxially with the sealing cylinder and arranged in the sealing cylinder, the sleeve has internal threads, the drill bit has external threads, the sleeve and the The drill bit is threaded and fixed relative to the drill bit; the surface of the sleeve away from the drill bit is provided with a plurality of sound insulation sheets, and the end of the sound insulation sheet connected to the sleeve is movable relative to the sleeve , the sound-insulating sheet has different lengths and widths; a plurality of springs are arranged adjacently around the edge of the sealing cover to form a housing cavity, one end of each spring is fixed to the edge of the sealing cover, and the other end is set There are counterweights.